Device and method for hot charging rotary hearth furnace direct-reduced pellets into furnaces

Abstract

The invention provides a device and method for direct reduction of pellets in a rotary hearth furnace and hot loading into the furnace. The rotary hearth furnace at the beginning of the transport track, the batching bin at the middle of the transport track, the lift shaft at the end of the transport track, the bridge crane on the top of the lift shaft, the material bell and the mineral heat below the bridge crane travel Furnace, the material bell is connected to the submerged arc furnace through the furnace bottom silo. In the present invention, the high-temperature pre-reduced pellets of the rotary hearth furnace are directly discharged into the heat-insulating closed material tank and transported to the bottom material bin of the submerged arc furnace, and uninterrupted circular transportation can be formed through multiple tracks to realize the pre-reduced balls of the rotary hearth furnace. The pellets are continuously added to the submerged arc furnace for smelting, which is not easy to be oxidized during transportation, and the heat loss is small, which can reduce the overall energy consumption and improve economic benefits. At the same time, the technical solution is simple, reliable, highly automated, compact in production, and easy to implement.

Description

technical field [0001] The invention relates to a rotary hearth furnace, in particular to a device and method for directly reducing pellets in a rotary hearth furnace and thermally charging them into a furnace. Background technique [0002] The production of ferrochrome by pre-reduction process of chrome ore pellets is an effective way to efficiently utilize low-grade chrome ore powder. The pre-reduction process of chrome ore pellets can be divided into rotary kiln method and rotary hearth furnace method. The rotary kiln method has the problem of pellet soft sintering kiln, so the rotary hearth furnace method is more suitable for the chromium ore pre-reduction process. The reduction degree of the direct reduction pellets produced by the rotary hearth furnace is 50%~70%. Therefore, the direct reduction pellets need to enter the submerged arc furnace for deep reduction to realize the separation of slag and iron to obtain the final ferrochrome product. [0003] The chromium o...

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Problems solved by technology

[0004] At present, there is no device and method for direct reduction of pellets in rotary hearth furnace and thermal loading into furnace. There are literature reports that rotary kiln method is used to thermally load into furnace. The rotary kiln is elevated, and the high-temperature direct reduction pellets are directly fed into the submerged arc furnace through the slide pipe. The bottom silo and submerged arc furnace bottom silo have a high elevation. This method also needs to be elevated for the pelletizer and chain grate, and the civil construction is complicated and expensive.

Due to the special structure of the rotary hearth furnace, it is difficult to adopt the elevated form

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